Field theory aspects of cosmology and black holes

TL;DR

This thesis explores field theoretic methods in cosmology and black hole physics, including generalized Chaplygin gas models and novel approaches to Hawking radiation flux calculations using anomalies.

Contribution

It introduces a Lagrangian formulation for generalized Chaplygin gas and proposes alternative anomaly-based methods for computing Hawking radiation fluxes.

Findings

Lagrangian formulation for GCG developed

New anomaly-based methods for Hawking radiation flux

Criteria for differentiating black hole vacua

Abstract

In this thesis we study some aspects of cosmology and black holes using field theoretic techniques. In second chapter, we present Lagrangian formulation for the non-relativistic as well as relativistic generalized Chaplygin gas (GCG). In rest of the thesis we discuss alternative approaches to compute the fluxes of Hawking radiation. These methods are based on covariant gauge/gravitational anomalies and chiral effective action. We also discuss a criterion to differentiate various black hole vacua within the framework of covariant anomaly approach.